Ip phone will not work over mobile 4g

Mavmaz · ‎02-09-2023

I have a Huawei Model:B535 - 232 with an EE sim.

I have a work phone Mitel 5330 that will not connect. It does work when connected via TalkTalk broadband but the connection speed is slow so I want to connect via 4g.

I just can't see what is blocking it connecting and not obvious where to get diagnostic data?

Christopher_G · ‎02-09-2023

Hi @Mavmaz

Welcome to the community.

Try forgetting all WiFi connections on the mobile, restart both devices and try again. Does it work any better then?

Chris

Mavmaz · ‎02-09-2023

The phone is an IP phone that connects to the 4g router with an ethernet cable.

Christopher_G · ‎03-09-2023

Ah, OK, thanks @Mavmaz

I'm not sure how an IP phone would perform over the mobile network. With fixed broadband, you get a fixed IP address. On the mobile network, we use CGNAT, which means you have a shared public IP address.

Chris

XRaySpeX · ‎03-09-2023

@Christopher_G : I think you mean to say that with fixed broadband, you get a unique IP address. With fixed broadband, you get a dynamic IP address.

@Mavmaz : Is this IP phone on a VoiP network?

If you think I helped please feel free to hit the "Thumbs Up" button below.

To phone EE CS: Dial Freephone +44 800 079 8586 - Option 1 for Mobile Phone & Mobile Broadband or Option 2 for Home Broadband & Home Phone

ISPs: 1999: Freeserve 48K Dial-Up > 2005: Wanadoo 1 Meg BB > 2007: Orange 2 Meg BB > 2008: Orange 8 Meg LLU > 2010: Orange 16 Meg LLU > 2011: Orange 20 Meg WBC > 2014: EE 20 Meg WBC > 2020: EE 40 Meg FTTC > 2022:EE 80 Meg FTTC SoGEA > 2025 EE 150 Meg FTTP

Christopher_G · ‎03-09-2023

That is what I meant, @XRaySpeX 🙂

Thank you.

Chris

Mavmaz · ‎04-09-2023

The phone connects to my work telephone network. I guess something run by Mitel? I naively assumed that it would work the same as when on broadband but reading about CGNAT I can see why that might cause an issue with voip. I think there isn't much more I can do.